The main cause of malfunctions in air conditioners is a shortage or excess of refrigerant. The pressure of freon in the air conditioner must clearly correspond to the specified parameters. It can be measured. But more often some signs speak of a decrease or increase. What is the danger of reducing or increasing pressure in the air conditioner? And how to recognize it? Read about it later.
Subcooling temperature
The lack of freon pressure in the air conditioner is due to leaks, and its excess is illiterate refueling. Both situations first lead to a decrease in efficiency, and subsequently to equipment breakdowns.
If the air conditioner is equipped with a thermostatic valve or expansion valve, and most of them are now, then the best indicator of the pressure level is the amount of cooling.
With a small subcooling, the pressure of Freon 410 in the air conditioner is not enough. With excess - the pressure is increased. The optimum value of refrigerant subcooling at the condenser outlet is from 10 to 12 degrees.
What is the danger of low pressure in the system?
The lack of pressure in the air conditioner negatively affects the operation of all components and mechanisms.
However, the most affected are the condenser, evaporator and liquid line. Since the refrigerant is less than normal, the evaporator does not fill up, cooling capacity decreases. The amount of steam in the evaporator is reduced. But the compressor works at normal speeds with a small amount of steam, which means that there is no way to create the necessary pressure. Evaporation temperature decreases, sometimes even to negative readings. Therefore, a “fur coat” freezes on the evaporator and fittings.
In the liquid line, due to the lack of Freon volume, its temperature rises up to a boil.
The compressor inlet temperature rises. It is cooled in pairs, so overheating and breakage are possible.
Insufficient pressure can be judged by:
- low productivity in the cold;
- low evaporation pressure;
- severe overheating;
- weak hypothermia (up to 10 degrees).
What is the danger of high blood pressure?
In air conditioners equipped with expansion valves, liquid cannot enter the evaporator. Liquid freon remains in the condenser, disrupting its main function. The heat exchange surface decreases, the gas penetrating the condenser is poorly cooled. Following the increase in steam temperature, the condensation pressure rises. At the same time, the liquid freon remaining in the condenser reacts with air, which leads to overcooling of this zone.
The temperature of the compressor rises and the electricity consumption rises, the engine gradually overheats and the compressor may burn out.
Signs of high pressure freon 410 in the air conditioner:
- poor performance in the cold;
- increased pressure of evaporation and condensation;
- supercooling value exceeded by 7 degrees.
If capillary tubes are used instead of expansion joints, excess freon can penetrate the compressor, cause water hammer and breakage.
